netdev - [PATCH wireless-next] brcmsmac: avoid 512 byte stack variable

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Message-Id: <1360268032-52414-1-git-send-email-tim.gardner@canonical.com>
Date:	Thu,  7 Feb 2013 13:13:52 -0700
From:	Tim Gardner <tim.gardner@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	Brett Rudley <brudley@...adcom.com>,
	Arend van Spriel <arend@...adcom.com>,
	"Franky (Zhenhui) Lin" <frankyl@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	"John W. Linville" <linville@...driver.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Pieter-Paul Giesberts <pieterpg@...adcom.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	linux-wireless@...r.kernel.org, brcm80211-dev-list@...adcom.com,
	netdev@...r.kernel.org
Subject: [PATCH wireless-next] brcmsmac: avoid 512 byte stack variable

Dynamically allocate the probe response template which
avoids potential stack corruption. Observed with smatch:

drivers/net/wireless/brcm80211/brcmsmac/main.c:7412 brcms_c_bss_update_probe_resp()
 warn: 'prb_resp' puts 512 bytes on stack

Cc: Brett Rudley <brudley@...adcom.com>
Cc: Arend van Spriel <arend@...adcom.com>
Cc: "Franky (Zhenhui) Lin" <frankyl@...adcom.com>
Cc: Hante Meuleman <meuleman@...adcom.com>
Cc: "John W. Linville" <linville@...driver.com>
Cc: Seth Forshee <seth.forshee@...onical.com>
Cc: Pieter-Paul Giesberts <pieterpg@...adcom.com>
Cc: Hauke Mehrtens <hauke@...ke-m.de>
Cc: linux-wireless@...r.kernel.org
Cc: brcm80211-dev-list@...adcom.com
Cc: netdev@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 drivers/net/wireless/brcm80211/brcmsmac/main.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
index c26992a..e392e76 100644
--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -7408,9 +7408,16 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
 			      struct brcms_bss_cfg *cfg,
 			      bool suspend)
 {
-	u16 prb_resp[BCN_TMPL_LEN / 2];
+	u16 *prb_resp;
 	int len = BCN_TMPL_LEN;
 
+	prb_resp = kmalloc(BCN_TMPL_LEN, GFP_ATOMIC);
+	if (!prb_resp) {
+		wiphy_err(wlc->wiphy, "wl: %s: failed to alloc %u bytes\n",
+			__func__, BCN_TMPL_LEN);
+		return;
+	}
+
 	/*
 	 * write the probe response to hardware, or save in
 	 * the config structure
@@ -7444,6 +7451,8 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
 
 	if (suspend)
 		brcms_c_enable_mac(wlc);
+
+	kfree(prb_resp);
 }
 
 void brcms_c_update_probe_resp(struct brcms_c_info *wlc, bool suspend)
-- 
1.7.9.5

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